P0816
Downshift Switch Circuit
P0816 is an OBD-II diagnostic trouble code meaning: Downshift Switch Circuit. Common causes: open or short circuit in switching circuit, gear shift sensor malfunction. Estimated repair cost: $17–56.
Symptoms
- Downshifting does not work
- Check Engine Light Flashing
- Car jerks when slowing down
- The gearbox goes into emergency mode
- Increased fuel consumption
Causes
- Open or short circuit in switching circuit
- Gear shift sensor malfunction
- Problems with the brake pedal or brake pedal sensor
- Malfunction of the transmission control unit
- Oxidation of contacts in connectors
How to Fix
- Check the integrity of the shift circuit wiring harness
- Test the downshift sensor
- Check the operation of the brake pedal and related sensors
- Read error codes from the transmission control unit
- Clean contacts and connectors in the circuit
Related codes
Error P0816 by Vehicle Brand
FAQ
What does the P0816 code mean?
P0816 is an OBD-II diagnostic trouble code that indicates: Downshift Switch Circuit
What causes a P0816 error code?
The most common causes of P0816 include: Open or short circuit in switching circuit; Gear shift sensor malfunction; Problems with the brake pedal or brake pedal sensor; Malfunction of the transmission control unit.
How do I fix a P0816 diagnostic trouble code?
To fix P0816: Check the integrity of the shift circuit wiring harness. Test the downshift sensor. Check the operation of the brake pedal and related sensors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0816?
Yes, but get it checked soon
How much does it cost to fix P0816?
The estimated repair cost for P0816 is $17–56. Actual cost depends on your vehicle, location, and labor rates.
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